Calculating machine



' l 1,612,969 Jan 4 1927' D. E. FELT Er A1.'

CALCULATING MACHINE Filed Sept. 7, 1922 4 Sheets-Sheet l subw Div @@QQw L Mii. I v

@dwz-v7? ,dm MMQWMW@ 1,612 969 Jan- 4 1927 D. E. FELT Er AL l CALCULAT ING MACHINE yFiled Sept. 7, 1922 4 Sheets-*Sheet 2 n f S 1,612,969 Jan' 4 1927' D. E. FELT ET A1.

CALCULATING MACHINE Filed Sept. 7, 1922 4 Sheets-Sheet 3 5g 5 J w Jan. 4 1927.

D. E. FELT ET Ax.

GALCULATING MACHINE Filed Sept. '7, 1922 4 Sheets-Sheet 4 mK @mv QQ Qmu Em Patented Jan. 4, i927.

.uNi'iianV STATES DORE E. I ELT, OF CHICAGO, AND JOSEPH A. V. TURCK, OF WILMETTE, ILLINOIS, AB-

SIGNOBB T FELT TABBANT MANUFACTURING COMPANY, Ol' CHICAGO, ILLI NOIS, A CORPORATION OF ILLINOIS.

C'ALCULATING MACHINE.

This invention relates to calculating ma-I chines, and has for its primary object to enable the erformance of the operation of division, w icther the factors be single or multiple place, without any necessityfor the person operating the machine keeping constant Watch over the various numeral or counter wheels, lest theooperation be con tinued after the remainder has become less than the, divisor and with the result that an erroneous result would be indicated.

In accordance-with the invention, provision is made whereby thev operationof the machine is arrested automatically as soon as the remainder -drops in value below the divisor, thereby requiriiigthe setting of one 'factoigfin the present instance-the dividend-to be transferred to the adjacent or- .dinal places, before the operation can be resinned.4 After each' shift, the operation ol the machine will be arrested wlienevei the remainder becomes less than the divisor and, when the operation is arrested during the final shift, the quotient will be indicated on one series of numeral wheels and another series, on which the dividend was set at the beginning of the operation, will show the ren'iainder, if any. By the invention, the .operation of division, on a calculating niachine is greatly facilitated and simplified and any necessity for mental work by the operator is greatly reduced while, at the same time, the liability tov error is practicallv eliminated, since the operator cannot continue to operate the machine when .the dividend of ordinal places corresponding to thel divisor has been reduced toa value below the divisor. 1

In addition to. the general objects recited above, the invention has for further objects suoli other improvements or advantages in construction and operation as may be found to obtain in the structures and devices here` iiiafter described or claimed.

In the vaccompanying drawings forming ya Figure 2 an enlarged top plan view having most otv the top plate of the casing broken away and having partsomitted in some of the orders to show the interior cofistrnction of the machine;

Figure 3 is a vertical section taken longitudinally along the front of the machine;

Figure 4 is another longitudinal vertical section but taken in a plane to the rear of Figure 3; f

Figure 5 is a transverse vertical section of the machine;

Figure 6 is another transverse vertical section of the mechanism in the rear of the machine but taken on a plane to the right of Figure 5;

Figure 7 is a perspective view showing one order of the mechanism for locking the machine when thevalue of the remainder is reduced below the divisor;

'Figure 8 is a perspective of a mechanism for locking the `machine against operation except when the carriage is in operative relation to other parts, as hereinafter described; andA Figure 9 is a detailed section taken on the line 9-9 of Figure 3 and showing part of a mechanism for preventing movement of the carriage out of its operative position during the movement of the operating crank.-

In \its present embodiment and for the sake of simplicity in construction and in the ensuing description, the invention has been incorporated in the very ancient type of calculating machine originally designed by :Gottlieb Leibnitz about the year 1690 A. D. and exemplified in variousy forms in the prior British Letters Patent to Thomas yde Colmar, No. 13,504 of A. D. 1851, and the Letters Patent of the United States to RobertRein, No. 897,659, dated September 1, 1908. For convenience, the present description will be confined to the embodiment of. this invention in a machine of the Leibnitz or Thomas type. The broadly novel features ofthe invention, as pointed out in the claims, may be applied to calculating machines of other ty es. Hence, the invention is not limited yin its scope to the particular construction and embodiment herein described as an illustrative example.

As the -details of the multiple-cylinder type of calculating machineare well-known and may be readily 4understood from the prior'British Letters Patent of Thomas de Colmar and the prior U. S. Letters Patent of Rein, both hcreinbefore referred to, a brief description of the general features of this type of machine, and such Vparts as are directlv concerned with the operation of the pr sent improvements Will be ample for an understanding of this invention.

As shown, the machine comprises a stationary casing 11 and carriage 12 shiftable longitudinally of the casing. The carriage 12' carries the accumulator showing the result When the arithmetical operation is accumulation i. e., in addition or multiplication, and also in subtraction; the carriage also supports another series of numeral Wheels for indicating another factor, for' example, the multiplier, in multiplying and the quotient when performing division. The casing 11 supports the actuator mechanism and for this purpose contains a suitable trame 18 constituted ot upright supporting plates or members for the various orders of the actuator mechanism.

rEhe actuator mechanism comprises a plurality of drums or cylinders le, one for each order of the machine, the said drums extending parallel With each other and transversely of the stationary casing, being mounted on the squared shafts 15. At their. forward ends, thesha'tts 15 are respectivel f provided with bevel gears 16 in mesh vvit evel gears 17 on the main drive shaft 18, the latter extending longitudinally of the casing in the front of the machine, as shown best in Figure 2. This main drive shaft 18 has at its extreme right hand end (viewing Fig. 2) a bevel gear 19 meshing with a bevel gear 20 at the lower end oiI the vertical operating shaft 21. At its upper end, above the top casing plate, the operating sha'ft 21 is provided with a hand crank 22, which, when turned in a clockwise direction, (viewing Figs. 1 and 2) operates, through the shafting and gearing just mentioned, to turn the actuator drums 11 in unison in a counterclocktvise direction.

1Each actuator drum 14 is provided on its periphery with a series of nine graduated or stepped teeth, arranged in the usual manner in accordance with the principal employed by Leibnitz and rhomas, the nine teeth representing the digits 1 to 9 inclusive and presenting a progressively increasing number ot actuating teeth in planes taken transversely through the drum at intervals from front to rear of the machine. llVith this construction, the transmitting pinion, it7 set (as will be presently described) at the extreme digital setting towards the front of the drum, will vbe engaged only by the actuator tooth of longest length and will therefore be imparted only a one-step movedrum, the transmitting pinion will be engaged by'all nine teeth and will then receive a nine-step movement each time the drum makes a complete revolution. lfVhen set at intermediate distances, the transmitting pinion will be actuated a number of steps corresponding with the number of the teeth which it can engage in its setting, theintermediate intervals corresponding to the digits between 1 and 9.

A transmitting pinion 23 is provided for each drum 14 and the several transmitting pinions are mounted to slide on squared shafts 24 extending parallel with the axes of the respective drums. The transmitting pinions 23 are each mounted at the bottoms ot' the slidable ,setting devices 25 having portions which project u Wardly through slots 26 in the top plate oP the main casing. Each setting device is provided at its upper end, above the top plate of the casing, with a finger knob 27 and with a pointer 28 to cooperate with the series of digits l to 9 inclusive and 0 indicated along the side ot the companion slot 26, the indication 0 being at the treme forward end of the slot and the digit "9 being at the extreme rear end ot the slot. When the setting device is adjusted so that the indicator 28 is opposite 0 the transmittingpinion 23 is positioned beyond the forward end of its corresponding drum 14 and thus Vwill receive no motion Jfrom said drum. adjustment of the setting device so that the pointer is opposite any one of the digits positions the setting device for engagement with a like number of teeth of the drum 14, with the result that a single rotation otl the drum 14 will impart to said transn'iitting pinion a stepped movement corresponding with its digital setting.

las shown especially in Figs.v 1 and 5', the stepped teeth do not exend clear around the periphery ot the drum, although a complete rotation of the drum is required to impart a predetermined movement of the 'transmitting pinion in any setting. A Geneva motion is provided to operate between the drum shaft 15 and the transmitting pinion shaft 24, for the purpose of locking the shaft 2t against rotation, except when the tooth portion of the drum periphery is in position for meshing with the transmitting pinion. This will occur toward the endof an operative rotation of the drum 14. Mounted on each transmittinfr shaft 2li is a Geneva Wheel 29 provided with ten arcuate cam surfaces 30 on its periphery. A cooperating cam 31 is slidably mounted on the correspondino drum shaft 15 and is provided with a peripheral portion 32 concenric with the axis of rotation of said shaft 15 and with an eccentric cut away peripheral face 83. Except when the toothed portion of the companion drum ment during a complete revolution of the 14 is in position for meshing with thetransdrum. If set at the extreme rear of the mitting pinion 23, the concentric peripheral Itin.

ltu

Lach transmitting shaft 24 extends rear- .wardly of the maincasing ll'and 1s provided at its rear end with a pair of beveled gears 34 and 35. The said gears 34 and 35 are mutually connected by a h ub 36, the latter being provided with a per1phera1 groove 37. The gears 34,35 to ether with their connecting hub 36 are sli ably mounted on the transmittin shaft 24 and the forward gear 34 is intended to impart forward rotation to the corresponding accumulator wheels while the other gear 35 is intended to impart rearward or backward rotation to said accumulator wheel. According to the design of the illustrated type of calculating machine, the forward rotation of the accumulator wheel is employed Vfor an accumulative arithmetical4 process, such as'addition or multiplication and the rearward or backward rotation of the accumulator' wheel is employed for the opposite arithmetical process, namelysubtraction or division'.

The accumulator wheels 38 are disposed in series extending longitudinally of the car- 'riage 12 and each accumulator wheel is mounted on a vertical spindle 39'journaled in the top plate 40 of the carriage and provided at its upper end with a finger knob 41 permitting 'a setting of the accumulator wheel, for purposes which will presently appear. The face of each' accumulator wheel 38 is provided with the digits l to 9 inclusive and 0, which will show through a companion sight opening 42 provided in vthe top plate of the carriage. The spindle 39 of each accumulator wheel is provided at its lower end, beneath the top plate 40 with a beveled gear 43 adapted to mesh with either the gear 34 or the gear 35 of the transmitting shaft 24. A rock bar 44 extends longitudinally of the vmachine and seats in the peripheral grooves 37 of the hubs 36 of the various orders of the machine. The rock bar 44 is mounted at its endsy on rock arms `45 and may be rocked rearwardly by a dle 46 by meshing the gears 35 with the gears'v 43 sets the machine for subtraction or division, while a rearward setting of said han,- dle 46 lby meshing the gears 34 with the` gears 43 sets the machine for addition or multiplication.

, Carrying mechanism is provided in each accumulator mechanism for the purpose of actuatin order ofg the machine whenever a carry is to go over from a lower order. A carrying cam 47 is fixed on the spindle 39 of'each accumulator wheel 38, the said carrying cam 47 having an operative throw with respect to the carrying mechanism of the next higher order, Whenever the accumulator wheel 38 of the next lower order passes from 9 to 0. Pivotally mounted So as to be in the path of the respective carrying cams 47 are the cam shifting levers 48 adapted to be moved by the operative impulses of the carrying cams of their next lower orders and by such movement to shift mechanism in the next higher orders for the purpose of imparting a carrying throw thereto. The

cam 31 on each drum shaft 15 is provided at its forward end, see Fig. 3, with a carrying-release cam 49 adapted to permit a one step movement of the transmitting shaft 24 at the close of the normal accumulative movementjmparted to said shaft by the corresponding drum 14 and transmitting pinion 23. The cam 31 is slidable toward the rear of the machine, such sliding movement being effected by an abutment 50 which moves in unison vwith the cam and is ada ted to be actuated by a carrying gear shiit lever 5l Whenever a throw is imparted to the cam shifting lever 48 by the carrying cam 47.

Mounted on the transmitting shaft 24 is a carrying gear 52 which 'is adapted to receive a carrying'impulse from a carrying arm 53 on the drum shaft 15 and slidable rearwardly with the cam 31 when the latter is shifted by the operation ot the carrying gear shift lever. The rearward movement of the cam 3l and the carryingarm 53 positions the cam Aface 49 in registry with the Geneva wheel 29 to permit the carrying throw, as hercinbefore explained and concurrently positions the carrying arm 51 so that the movement of the shaft 15 will cause said arm 53 to engage a toothof the carrythe accumulator of the next higher' lll) movement to its corresponding accinnulator has been released -by the movement of the carrying cam 47 of a lower order, both the cam face 49 and the carrying armf53 are out of registry with ,the Geneva wheel 29 and the carrying 'gear 52, so that no carrying impulse will be imparted to the accumulator by therotation of the drum shaft 15.

ywheel 38. Except when a carrying impulse A cam 54 on the' shaft 15 and engageable by a pin 55 projecting from the longitudinal vertical frame plate shifts the cam 31 wheel 62.

and the carryinel arm 53 back to normal position, during the further rotation of the drum shalt 15 after the carrying impulse. 'l'helike i'orward movement o the abutment 50 restores the gear shift lever 5l and the cam shifting lever 48 to normal position.

A second series oi numeral wheels 56 is mounted in the top plate of the carriage. Each ot said numeral wheels 56 is provided with a vertical spindle 57 journaled in the top plate and having at its end above said plate a linger knob 58. v The indications ot the respective numeral wheels 56 show through sight openings 59 in the top plate of the carriage. llach numeral wheel 56 is provided with two sets of digits from lto 9 inclusive and with the indication 0, one set ot digits denoting a forward accumulative movement of the main accumulators` 38 and the other set of digits denoting a reverse operation ot said accumulators 32', such as would be employed in subtraction or division. llach numeral wheel 56 is provided with peripheral gear teeth 60 to im,-

part a step-by-step rotation to the wheel.

'lhe drum shaft 15 of the tirst order tothe right of the machirieis geared with reduction gearing 6l to ellect a one stepI movement ot a toothed wheel 62 for each complete rotation ot' the operating cranlr 22 andv the several drum shafts 15,0t` the machine. They carriage. l2 supporting the main accumulators 2&8 and the numeral wheels 56 is both pivotally and slid-ably mounted on a longitudinal rod 63; and, with this construction, anyone ol the numeral wheels 56 may be selectively shitted so that its gear teeth 60 are brought into registryv with the toothed 'lhis will wheel 56 one numeral space for each complete rotation ot the operating crank 22.

Zeroizing mechanism is provided for the purpose ot' restoring the main accumulators 38 and the numeral wheels 56 to Zero or to normal. The 'main accumulators are provided respectively with the zeroizing gears il and the numeral wheels 56 with zeroizing gears 64. lteciprocatory bars 65 and 66, provided with raclr teeth are adapted respectively to be brought into mesh with the series of zeroizing gears 63 and 64. The reciprocation otl said bars when so enmeshed with their respective gears will restore the accumulators 8S and the numeral wheels 56 to zero. 'lhe zeroizing operation is accomplished by rotating the Zeroizing handle knobs 67.

Such is,l in brief outline, the manner in which accumulations and carry impulses are imparted in the calculating machine of the type selected for illustrating the present inventiou.

lt it be desired to perform an accumulalive arithmetical function on the machine just described, the setting handle is moved rotate the numeraltoward the rear of the machine, so that it will be opposite the symbol Add or mul. This, as hereinbefore explained, sets the machine for effecting forward rotation of the mein accumulators 38 by positioning the forward transmitting gears 34 to mesh with the accumulator gears 38. In performing addition, the carriage may be shifted arbitrarily so that any desired orders oi the main accumulatore are in operative relation with respect to any desired orders ot the actuator mechanisms. lt will be found convenient however, as indicated in Fig. l, to position the carriage so that the extreme right hand order oi the accumulator mechanism corresponds with the extreme right hand order of the actuator mechanism. lieore commencing the operation, the accumulators 38 are set to normal or zero. 'l`he digits ot the several orders ot' each number to be added may then be successively set up by shittingI the setting devices 25 and thc numbers successively transterred to the accun'mlators 38 by successive operations oi the operating crank 22. filter each setting gli a number to be added the operating crank 22 will be given a complete rotation, the carrying mechanism operating during the motion ot' said crank to transfer, whenever necessary, carrying impulses from lower orders to the next higher orders. lllhen all oi. the numbers have been set up and successively transferred to the accun'iulators 38, the sum will show through the sight openings 42.

lf it be desired to perform multiplication with the machine, the accumulatore 38 are first reset to zero, and one ot the factors ot the example to be performed, such as the multiplicand, may be set up in the actuating mechanism by moving the setting devices 25. The lowest order ot the multiplicand may appear at the extreme right of the machine, if desired, although this is not nec` essary if all orders other than those containing thc multiplicand setting be set at zero. The operation ot multiplication may be performed either beginning with the lowest order of the multiplier and continuing the multiplication upwardly until the highest order is completed, as is customary in performing multiplication mentally, or the process may start with the highest order ot the multiplier and the operation continued downwardly until the units order ot the multiplier has completed its multiplying function; In performing multiplication according to the last mentioned method the carriage is first shifted toward the left so that the top ligure of the multiplier will correspond with the lowest figure of the mulf tiplicand set up in the actuating mechanism. `When multiplying from right to left however, the carriage is positioned initially' so that the lowest figure of the multiplier corresponds with the lowest figure of the imultiplicand. Whatever method employed, the operating crank 22 is rotated a number of turns correspondin" with the digitall value of eachV orderso the multiplier and when each ordinal multi lying function hasbeen completed the carriage is shifted one ordinal space to bring the next laccumulating.

tors, whether to the right or to the left, in operative relation with the multiplicand set- When all the orders of the muliplier have been exhausted, the product .will show in the `sight openings of the main accumulators 38.

In accordance with the principal vof op eration of the calculating machine just described, the arithmetical calculations of subtraction or division are performed by im parting rotations to the main accumulators 38 reversely with respect to the arrangement of the digital values on said accumulators. To perform eithersubtraction or division the settin handle 46 isv adj usted toward the front of t e machine, as shown 'in Fig. 1, so that said setting handle is opposite the symbal Subt or div, whereby the rotation of the o erating crank 22 will rotatethe accumu ators 38, reyersely through the actuating mechanism, instead of forwardly as iii addition' or multiplication.

To perform subtraction, one factor of the problem, such as the minuend, may be set up on the series of accumulators 38, preferably from right to left of the machine for as'many ordinal places as there are ordinal laces in the miiiueiid. The subtrahend may e set up in the actuating mechanism by proper shifts of the setting devices 25, and the carriage 1.2

- from the next highest order instead of adding a value as in multiplication or addition. The machine has the .further capacity of performing the operation of division, and itl is the object of the present invention to enable the performance of division, not only substantially Without mental effort by the operator, ybut also practically to eliminate any possibility lof error in performing the calculation.L To perform division, the dividend is set up on the accumulators38 and the divisor is set up in the actuating mechanismv by'adjusting the setting devices 25. The carriage is positioned so thatthe highest number of the dividend is in the saine order of the machine as the highest ynumber of the divisor.v For example should it be desired to divide 8,972,463 by 3,549, the divisor will be set up from left .to right'in the orders of setting devices as shown in Fig; 1 and tlie dividend will be set up in the accumulators 38. The carriage will be initially pou sitioned so that the number 8, the highest order of the dividend is in the saine order of the machine as the number 3, the highest order of the divisor. In order to divide, the setting handle 46 is set at the symbol Subt or div and the operating crank 22 is rotated for as many revolutions as can lbe vmade until tliefirst four figures of the dividend become less than the divisor. Whenever this occurs, the carriage must be shifted toward the right an ordinal space and the subtraction operation repeated until the i'emaindei'in the effective orders is less than the divisor., The operation of first subtraction for as many operations as can be made and then the shifting of the carriage is continued until the last place of the dividend corresponds with the last place of the divisor and the final remainder, if any has been reduced to a value below that of the/divisor.v The quotient will show in the set'of numeral wheels 56 read from left to right of ythe machine and the remaindenif any, will show in the accumulators 38. If there be no remainder all of the previously set accumulators 38 will show the symbol 0 through the sight openings.

The mainkoperating shaft 18 of the ma- 10 chine is provided with ordinal stop abutments 68, any one of which may cooperate with an individual stop mechanism to arrest the motion of the shaft 18, should the remainder drop in value below the divisor. The stop mechanisms are respectively controlled not only by both factors of the example in the orders in which they operate but also by each other so that the mere dropping in value of one digit of the remainder 11 below the corresponding ordinal digit of the divisor, although the entire remaindery is still greater than the divisor, would not result in arresting the operation of the machine. In

other Words, the control of the ordinal stop mechanisms by each other is such that the value of the entire remainder must be less than the value of the entire divisor in the corresponding ordinal places before any of the stop mechanisms can be released to arrest the operation of the, machine.

Pivotally mounted at 69 to the front face of a vertical supporting plate 70 and arranged in the several orders of the actuating mechanism are stop levers 71. Each stop lever- 71 is provided with a depending stop arm 72 adapted to be shifted into the path of movement of the corresponding abutment 68 to arrest the motion of the main operating shaft 18 when the stop lever .130

is turned about its pivot in a clockwise directions as viewed in Fig. 3. With the exception oi the stop lever in the highest order, cach lever is furthermore provided with a downwardly inclined trigger arm 78 extending to and beneath the depending arm i et bell cranlr trigger 75, located in next higher order. rlfhese bell cranlr triggers 'l5 are provided in each order out the machine with the exception ot the lowest order are pivoted onV the pivots 69 et their respectively cooperating stop levers. 'lhe other arms 'll' of the bell crank triggers 76 are connected by springs 78 with the de` pending stop arms 72 of their respective stop levers. W ith this construction, no stop lever in a lower order can move to its shattarrcsting position unless `the trigger 75 of the next higher' order has been moved to a position to release the trigger arm 73 of the lower order and consequently the operation ot each stop lever is controlled by the trigger' mechanism operated by the stop lever of the next higher order. The stop levers arelurthermore provided with upwardly projecting release arms 79 terminating in bifurcations 80 in which seat pins 81 projecting from the forward ends of the lower members 82 of the stop-setting lever device 83.

llach stop-,setting lever device is constituted or" an upper lever member 84 and the before-mentioned lower lever member 82, both lever members being pivoted together at 85 near the rear end ot the upper lever member 8d. 'lhe stop-setting lever devices are respectively arranged in the various orders of the machine and extend horizontally across the top of the actuating mechanism and along the path of movement of the betorementioncd actuating mechanism sett'inr devices 25. 'llhe upper lever members 84: or the respective stop-setting lever devices are pivoted at their forward ends respectively to uprights ot the fixed vertical plate 7 0,` as shovvn at 86. rlhe lower lever member 82 of each lever device extends rearwardly beyond the upper lever member 84 and is provided at its rearmost end With a 'eeler hook y87 adapted for cooperation with a stepped disk 88 of the corresponding accumulator wheel 38. Each stepped cam 88 is rotated in unison with its corresponding ordinal accumulator 38 and is provided with ten steps or faces 89 one for each of the ten symbols of the accumulator. The steps 89 of each disk 88 are disposed at progressively increasing distances from the axis of rotation oit the corresponding accumulator with the step of greatest distance or axial dimension, corresponding to the 0 point of the accumulator and with the step 89 of the least distance corresponding to the 9 point of the accumulator. These stepped disks 88 have the function of imposing restrictions in varyromeu@ ing degree on the movement of the 'eeler hook 8? toward the center of their respective accumulatore, the amount o' restriction being determined by the position oni' the accumulatore.

Along its lateral edge facing the s tting device 25, the upper lever member 8l o4 each stop-setting device is provided vfitl stepped obutments 90, said ahutments 9 e ing disposed at progressively incree-sim.,l distances from 'iront't rear ol the machine with respect 'to the transverse path ot movement oi the setting devicesv 25. ln other Words the stop abutment at the 0 point ol the setting device 25 is so located as to be substantially in contact' with the body of said setting device, when the lever member 8d is at rest, whereas the stop abutment located at the 97 point ot the setting device, is at its maximum distance from the body of said setting device to permit a maximum movement of the stop-setting mechanism toward the. setting device and toward the beforementioned stepped cam 88.

ln the operation of the machine for performing division, the several stop-setting' mechanisms are oscillated toward and trom their respective stepped cams 88, the degree of oscillation of the individual setting mechanisms being determined by the adjustment of the respective setting devices 25. The oscillation of the stop-setting mechanisms is etifected by means ot' a reciprocatory bar 91 extending longitudinally of the machine and provided With slots 92 through which both' members 82 andS/l ot' the stop-setting nie-chanisms extend, as shown in Figs. l and 8. The slots 92 permit a yielding movement ol the stop-setting mechanisms relatively to the bar 91, as `will be presently described. its right hand end (Fig. 4) the reciprocatory bar 91 is provided with a stud 93 which enters a-hiurcation 94 in the upper arm ot' a rocker assembly 95 mounted on a transverse shaft 96. The rocker assembly 95 is fprovided with a pair of arms 97 having rollers 98 and 99 which respectively engage the cam surfaces 100 and 101 of a cam assembly 102 that is slidably mounted on the drum shaft l5 in the first order to the right of the machine. The cam 101 is shifted into position for engaging the arm 99 of the rocker assembly by the movement of the shift bar i-l in setting the machine for division or subtraction. For this purpose the cam 101 is connected with said shift bar 44 by means ot an extension 103. lVhen the machine is set for addition or multiplication, the-cam 101 is moved outof its engaging position tvith respect to the arms 99 of the rocker assembly so that the reciprocatory bar 91 and the several stop-setting mechanisms remain stationary during addition or multiplication. llVith the exception of the stop-setting mel1anism in the lovvest order of the machine, thel sev- -eral stop-setting mechanisms are connected by springs 1M with lugs 105 depending from the reciprocatory bar 91. The lowest order sto setting mechanism is connected by a spring 106 direcotly to said reciprocator bar 91. With the construction just desribe and shown, and assuming that the machine has been set to perform division, the turning of the crank 22, through the cams, the rocker assembly and the reciprocatory bar 91, will impart a left to right and return movement of each of the various stop-setting lever mechanisms 83 of the machine, said movenient occurring toward'the end of an operative rotation of the. crank 22, and after all movement of the ac 'umulators 38 has ceased.

As hereinabove stated, in performing division the dividend is set up on the accumulators 38 and the Idivisor in the actuating mechanism by the setting'devices 25. Having-set up the example to be performed and having positioned the carriage so that the" highest order of the dividend correspondsin ordinal position with the highest order of the divisor, (provided the divisor is not larger than they corresponding figures of the dividend) the operator may then turn the actuating' crank 22 to rotate the various orders of the dividend corresponding with the various orders of the divisor backwardly for a distance determined by the setting in the various orders ot thedivisor. In other words, assumiugfthat the highest order of the dividend be set at 8 and the highest order of the divisor at 8, the accumulator 38 will be rotated rearwardly three numeral spaces for each complete revolution of the crank 22.

'Similar rearward rotation takes place in the other corresponding orders of dividend and divisor in accordance with their settings.

'During each rotation of the crank 22, the

several stop-setting mechanisms are moved toward the setting devices 25 and toward,

, their settings, to impose various restrictions in movement toward the right to the stop setting mechanisms. In the course of the retrograde action of the accumulators 38 their individual registration will either register a figure or cipher. equivalent to the divisor setting ofthe setting device 25 in the corresponding order or will drop below such divisor setting. As for instance if the accumulator 38 registered 8 and the divisor was set for 4, the retrograde action of the accumulator 38 iri that order would bring it to register 4, whereas if the divisor was set for 5, the retrograde action vwould leave a registration of 3, which would be less than the divisor setting. Assuming, however, that in the course of such retrograde action the reg-` istration becomes equal to the divisor setting, tl1e feeler hook of the companion stopsetting mechanism is arrested by said accumulator cam step/ before the u per lever member 84 of the stop setting meclianism has reached the limit of its movement determined by the sett'ng of the device 25. When this takes lace, the lower leverfmember 82 is shift@ about the pivot 85 relatively to the upper member 84, so that the pin 81 causes the upper arm of the stop lever 7l to.y travel toward the right and the trigger 75 toward the left just suiiciently to release the trigger 'arm 74 of the stop lever in the next lower order. The movement at this time, however, is not great enough to throw the stop arm 72 into the path of the abutment 68 on the power shift. Should a step 89 corresponding with a digit of the accumulator less 1n value than that determinedA by the setting device 25 bc presented to the feeler hook during the movement of the stop-setting mechanism, as would ha )pen in the event the remainder igures fel below the divisor figures, the relative movement of the lower lever member 82 would then be great enough to shift the stop arm 72 into` the path ot' the corresponding abutment 68, provided that the stop lever 71 is released bv the operation of the trigger' of the next hifrlierorder, in the manner just described. l(/onsc uently asreach locking lever Tl is controlled y' the operation of the locking lever of the next higher order and thus controls the operation of the locking lever of the next lower order, a movement to stop the main power shaft cannot take place until the remainder has been reduced in value below the divisor. In other words,` the mere dropping of an individual digit of the remainder helowa corresponding digit of the divisor while any digit of a higher order in the remainder is greater than a digit in the corresponding higher order of the divisor would not effect the operation of the stop mechanism. Ofttimes in division the highest. digit in the divisor is greater than the digit in the highest ordinal place in ,the dividend and, as in mental calculation, the divisor or dividend must be set over, leaving the highest place in the dividend to the left of the highest place in the divisor. It is usual in such cases to set the carriage over to the left one space, which is the equivalent to setting the divisor one place lower or to the right. Under such conditions the stop lever 71 cooperating with the highest order settingdevice 25 for the divisor must be contiolled until the highest order wheel of the dividend reaches 0 in its retrograde action of division. Thus an extra set of stop setting levers 82-84 are provided to co-act with the stepped cam 88 and with a fixed pinlocated on the underside of the top plate 11 in the same iccationof its order as the setting devices 25 hold in their respective ore flow wheel of the dividend setting reaches 0, the lett-most trig er 76, operated by 'these extra stop setting evers, will not allow Aany of the lower stop levers 71 to move into'stopping position.4 rlhe springs 104ipcrmit the lower lever members 92 to yield Without moving the stop arms 'to shaft-an sition, whenever the leve i o? such position oy the nent higher orders.

ld/vhenever e stop arni 2 is itie path of an aberw ent 38, the op -anon the kshaft 181i?) autom .tically arrested cannot be resumed until the stop levers 71 are restored to normal position. This may be effected by a slide bai1 107 having pins 108' for the various stop levers 71 and arranged when the slide bar 7() is shifted toward the right, to engage the depending stop arms 72 ci 'the level 1 and to restore them to normal position, `with the trigger arms 74 latched under the triggers 75 ot the rie-fit higher orders. r1`he release bar 107 is rovidedl with an operating handle 109 w iich extends through a slot in the top plate ot' the main casing. [A spring 110 connecting said bar with the ieit hand side plate maintains the bar in normal position so that thev pins 108 are held out ot engagement "with the stop l vers 71.

inrovision is made for preventing a lifting movement or" the carriage 11 during the operation o the stop-setting levers and until the crank has reached the neutral position to prevent damage to the levers. Referring to 'Figs 4, 6 and 9 a latching hcolr 111 is pivoted at 112 on the right side ot the trame and is arranged to hook over the torn/'ard edge ot' the carriage plate to prevent liting or the same. A spring 113 connecting said last hook with a iixed portion of the frame operates to -retract the' hook normally out ot its locking position. Projecting latorally from the hoolr 111 is an arm 1M carrying a roller 115 which bears against a cut away surface 116 Jformed on an arm 117 projecting from the right hand side of the rocker assembly 95. During the operation of the crank 22, the rocker assembly is rocked toward the right bv the cam 102 and such movement will 'force the cut away face 116 into engagement with the roller 115 of the locking hook 111 to move the latter rearwardly into its looking position. When, however, the crank 22 is at normal, the surface 116 has been moved out of the path of the roller 115 to permit the spring to retract the hook 111 into inoperative position.

A further safeguard in the form of lock-i ing means is also provided whereby the operating crank 22 is locked against rotation Whenever .the carriage 12 is lifted thus preventing the stop-setting levers from being thrown under the accumulatore and thus damaged by return of the carriage. As shown :imanes in Fig. 7, the rearward end of 'the drum to cause the paivl 119 to engage a l the ratchet 118 and prevent ro drum snare; wim the result 22 is lociredl against rotation.

shaft 120 is an arm 1211 adapted to if gaged by .the supporting plate 12o or accumulator' gears. "When the carriage lowered into operative position with respect to the actuator mechanism, c te 125 will depress the arm 1241 and cause rae shaft 12@ to rotate against the power of the spring 122 to litt the paul 119 out of locking engagment with the ratchet 118.

The invention as hereinabove set may be variously embodied Within the oi' the claims hereinafter made.

ill/'hat is claimed is:

1. The combination of a dividend register, a setting register, means for cperatingthe dividend register, and means controlled by the dividend register and the setting register for arresting the motion of the said register When the remainder is less than the divisor.

2. in a calculating machine 'tor performing division, in combination: a series oi registering wheels adapted to be set to indicate the dividend; actuating devices for said registering Wheels; driving means 'for said actuating devices; setting devices respectively cooperating with said actuating devices ior permitting predetermined actuations ot the dividend registering wheels; stop mechanisms for arresting the motion ot the driving means and corresponding to the actuating devices, each stop mechanism being controlled by the stop mechanism of the next higher order and itself controlling the operation of the stop mechanism .of the next lower order; and ordinal stop-setting mechanisms companion to the respective stop mechanisms each stop-setting mechanism being controlled by the adjustment or the setting device and the dividend registering Wheel of its corresponding order; substantially as specified.

3. In a calculating machine Jfor performing division, in combination: registering mechanism adapted to be set to indicate the dividend; actuating mechanism ior said registering mechanism; means for setting said actuating mechanism to permit predetermined actuations ot the registering mechanism; means for indicating the quotient value; stop mechanism for arresting the motion of the actuating mechanism; and stop forth scope llltl settingmeclianism controlledboth by the adjustment ofl the registering mechanism and the actuating mechanism; substantially as specified. j

4. In'a calculating machine for performingdivision, in combination: a series of registering wheels adapted to be set to indicate the dividend; stepped cams respectively driven by said registering wheels; actuating.

saine, said stop setting mechanisms respectivelyv being yoperated to release their controlled stop mechanisms when a setting of the registering wheel cam corresponds with a setting of the setting device in the saine order; and means for periodically shifting said stop mechanisms into vposition for being engaged by the settingdevices and the registering wheel cams; substantially as specified. y

r 5. In a calculating machine for performingI division, in combination: a series of registering wheels adapted to be sc t to indicate the dividend; actuating devices for said registering wheels; setting dcvicescrespectively cooperating -witli said actuating devices fer permitting predetermined actuationsl of thev dividend registering wheels.; another series of registeringwhees for indicating by op erations of said drivingmeans the quotient value in each order; and means forar'resting the motion of` said actuating devices whenever the remainder in the dividend registering wheels is less in value than the divisor set up in the actuatingl devices; sub` stantially asspecified.`

6. In a calculating machine for erforming division, in combination: ca culating mechanism includinga dividend register, a quotient register and a divisor register; means for` setting up the dividend and the divisor in their respective registers; drivin means for said calculating mechanism; an means controlled both by the dividend register and by the setting in the divisor. re ister `for arresting the motion of said driving means; substantially as specified.4

7. In a calculating machine for erform-A ing division, in combination: ca culating mechanism including a dividend register, a

quotient register and a divisor register; means for setting upv the dividend and the divisor in their respective registers; drivin means for said calculating mechanism; and

V.driving-means arresting) means for arresting the motion of said driving means Whenever the remainder 1n the dividend register is less in value than the divisor in the divisor register; substantially as specified. v

8. In a calculating machine for rforming division, in combination: ca culatin mechanism including an ordinal dividen register, an ordinal quotient register and an ordinal divisor register; means for setting up the dividend and the divisor in their respective registers; a unitary driving means for said calculating mechanism; ordinal devices, each arresting device controlled y the arresting device 'of the next higher order, and also controlled both by the operation of the dividend register and by the setting in the divisor register; substantially as s ecifie 9. A calculating mac ine that performs division, comprising a calculating mechanism, means for setting up the` numerical Vdividend and divisor in said calculating mechanism `and means, controlled by the dividend remainder and the divisor setting, for automatically arrestiii the motion of the calculatingmeclianisnn W ereby the operation of the calculating mechanism is stopped whenever the dividend remainder becomes less in value than the divisor, substantially as specified.

l0. The combination of a main drive shaft, bevel gears thereon, bevel gears driven by said gears, squared shaftsv driven b said gears, drums on said vsquaredshafts aving teeth of graduated lengths, pinions adiustlable -alonv'said'drums and driven by the teeth of tlie latter, squared shafts on which said `pinionsv are adjustable vand driven b said pinions, slidablesettin devices for a .kjusting said. pinions,agfixe series of digits .for said setting devices lindicatingthe number of teeth on said drums-which'will actuate the pinions,yGeneva wheels on said pin-- ion shafts, cooperating cams slidableon said drinn shafts whereby the pinion shafts 'are normally lieldlfromrotation and are releasedito be turned by said drums and pinions, oppositely arranged bevel gears slidable on ysaid pinion .shafts, accumulator lWheels having gears adapted to be driven In testimony whereof wei-i1 vhave vhereuntii set our hands.

' DORRE FELT.

.JOSEPH A. v. TURCK. 

